On a sharply quartering away shot the more spine the arrow has the less chance that it is gonna pole vault on impact. I think if that is fact, the shorter arrows have a stiffer spine and will eliminate " pole vaulting" I have taken asharply quartering away shot with no problem using long200 carbonsarrows and mechanicals out of my vert with no problem so who knows..I sure don't worry about an overdraw on my vert anymore as I seem to get better stability with long arrows and I could give a rats ass about a few extra fps...>>>>>>>>>>Whac k!!!!!